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<?php class STon { private static $instance; protected static $item; public static function get() { if (static::$instance === null) { static::$instance = static::$item; } return static::$instance; } } class A extends STon { protected static $item = "A"; } class B extends STon { protected static $item = "B"; } var_dump(A::get(), A::get(), B::get(), B::get(), A::get(), A::get(), B::get(), B::get());
Output for git.master, git.master_jit, rfc.property-hooks
string(1) "A" string(1) "A" string(1) "A" string(1) "A" string(1) "A" string(1) "A" string(1) "A" string(1) "A"

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